X-Git-Url: http://cvs.zerfleddert.de/cgi-bin/gitweb.cgi/proxmark3-svn/blobdiff_plain/54e3cfcb74fbc02f7d1d16be8cd5338529acd58e..95b697f017a4e9af954fdc766e614f67b8e290d1:/client/emv/emvjson.c diff --git a/client/emv/emvjson.c b/client/emv/emvjson.c new file mode 100644 index 00000000..02297435 --- /dev/null +++ b/client/emv/emvjson.c @@ -0,0 +1,355 @@ +//----------------------------------------------------------------------------- +// Copyright (C) 2018 Merlok +// +// This code is licensed to you under the terms of the GNU GPL, version 2 or, +// at your option, any later version. See the LICENSE.txt file for the text of +// the license. +//----------------------------------------------------------------------------- +// EMV json logic +//----------------------------------------------------------------------------- + +#include "emvjson.h" +#include +#include +#include +#include +#include +#include "util.h" +#include "ui.h" +#include "proxmark3.h" +#include "emv_tags.h" + +static const ApplicationDataElm ApplicationData[] = { +{0x82, "AIP"}, +{0x94, "AFL"}, + +{0x5A, "PAN"}, +{0x5F34, "PANSeqNo"}, +{0x5F24, "ExpirationDate"}, +{0x5F25, "EffectiveDate"}, +{0x5F28, "IssuerCountryCode"}, + +{0x50, "ApplicationLabel"}, +{0x9F08, "VersionNumber"}, +{0x9F42, "CurrencyCode"}, +{0x5F2D, "LanguagePreference"}, +{0x87, "PriorityIndicator"}, +{0x9F36, "ATC"}, //Application Transaction Counter + +{0x5F20, "CardholderName"}, + +{0x9F38, "PDOL"}, +{0x8C, "CDOL1"}, +{0x8D, "CDOL2"}, + +{0x9F07, "AUC"}, // Application Usage Control +{0x9F6C, "CTQ"}, +{0x8E, "CVMList"}, +{0x9F0D, "IACDefault"}, +{0x9F0E, "IACDeny"}, +{0x9F0F, "IACOnline"}, + +{0x8F, "CertificationAuthorityPublicKeyIndex"}, +{0x9F32, "IssuerPublicKeyExponent"}, +{0x92, "IssuerPublicKeyRemainder"}, +{0x90, "IssuerPublicKeyCertificate"}, +{0x9F47, "ICCPublicKeyExponent"}, +{0x9F46, "ICCPublicKeyCertificate"}, + +{0x00, "end..."} +}; +int ApplicationDataLen = sizeof(ApplicationData) / sizeof(ApplicationDataElm); + +char* GetApplicationDataName(tlv_tag_t tag) { + for (int i = 0; i < ApplicationDataLen; i++) + if (ApplicationData[i].Tag == tag) + return ApplicationData[i].Name; + + return NULL; +} + +int JsonSaveStr(json_t *root, char *path, char *value) { + json_error_t error; + + if (strlen(path) < 1) + return 1; + + if (path[0] == '$') { + if (json_path_set(root, path, json_string(value), 0, &error)) { + PrintAndLog("ERROR: can't set json path: ", error.text); + return 2; + } else { + return 0; + } + } else { + return json_object_set_new(root, path, json_string(value)); + } +}; + +int JsonSaveBufAsHex(json_t *elm, char *path, uint8_t *data, size_t datalen) { + char * msg = sprint_hex(data, datalen); + if (msg && strlen(msg) && msg[strlen(msg) - 1] == ' ') + msg[strlen(msg) - 1] = '\0'; + + return JsonSaveStr(elm, path, msg); +} + +int JsonSaveHex(json_t *elm, char *path, uint64_t data, int datalen) { + uint8_t bdata[8] = {0}; + int len = 0; + if (!datalen) { + for (uint64_t u = 0xffffffffffffffff; u; u = u << 8) { + if (!(data & u)) { + break; + } + len++; + } + if (!len) + len = 1; + } else { + len = datalen; + } + num_to_bytes(data, len, bdata); + + return JsonSaveBufAsHex(elm, path, bdata, len); +} + +int JsonSaveTLVValue(json_t *root, char *path, struct tlvdb *tlvdbelm) { + const struct tlv *tlvelm = tlvdb_get_tlv(tlvdbelm); + if (tlvelm) + return JsonSaveBufAsHex(root, path, (uint8_t *)tlvelm->value, tlvelm->len); + else + return 1; +} + +int JsonSaveTLVElm(json_t *elm, char *path, struct tlv *tlvelm, bool saveName, bool saveValue, bool saveAppDataLink) { + json_error_t error; + + if (strlen(path) < 1 || !tlvelm) + return 1; + + if (path[0] == '$') { + + json_t *obj = json_path_get(elm, path); + if (!obj) { + obj = json_object(); + + if (json_is_array(elm)) { + if (json_array_append_new(elm, obj)) { + PrintAndLog("ERROR: can't append array: %s", path); + return 2; + } + } else { + if (json_path_set(elm, path, obj, 0, &error)) { + PrintAndLog("ERROR: can't set json path: ", error.text); + return 2; + } + } + } + + if (saveAppDataLink) { + char * AppDataName = GetApplicationDataName(tlvelm->tag); + if (AppDataName) + JsonSaveStr(obj, "appdata", AppDataName); + } else { + char * name = emv_get_tag_name(tlvelm); + if (saveName && name && strlen(name) > 0 && strncmp(name, "Unknown", 7)) + JsonSaveStr(obj, "name", emv_get_tag_name(tlvelm)); + JsonSaveHex(obj, "tag", tlvelm->tag, 0); + if (saveValue) { + JsonSaveHex(obj, "length", tlvelm->len, 0); + JsonSaveBufAsHex(obj, "value", (uint8_t *)tlvelm->value, tlvelm->len); + }; + } + } + + return 0; +} + +int JsonSaveTLVTreeElm(json_t *elm, char *path, struct tlvdb *tlvdbelm, bool saveName, bool saveValue, bool saveAppDataLink) { + return JsonSaveTLVElm(elm, path, (struct tlv *)tlvdb_get_tlv(tlvdbelm), saveName, saveValue, saveAppDataLink); +} + +int JsonSaveTLVTree(json_t *root, json_t *elm, char *path, struct tlvdb *tlvdbelm) { + struct tlvdb *tlvp = tlvdbelm; + while (tlvp) { + const struct tlv * tlvpelm = tlvdb_get_tlv(tlvp); + char * AppDataName = NULL; + if (tlvpelm) + AppDataName = GetApplicationDataName(tlvpelm->tag); + + if (AppDataName) { + char appdatalink[200] = {0}; + sprintf(appdatalink, "$.ApplicationData.%s", AppDataName); + JsonSaveBufAsHex(root, appdatalink, (uint8_t *)tlvpelm->value, tlvpelm->len); + } + + json_t *pelm = json_path_get(elm, path); + if (pelm && json_is_array(pelm)) { + json_t *appendelm = json_object(); + json_array_append_new(pelm, appendelm); + JsonSaveTLVTreeElm(appendelm, "$", tlvp, !AppDataName, !tlvdb_elm_get_children(tlvp), AppDataName); + pelm = appendelm; + } else { + JsonSaveTLVTreeElm(elm, path, tlvp, !AppDataName, !tlvdb_elm_get_children(tlvp), AppDataName); + pelm = json_path_get(elm, path); + } + + if (tlvdb_elm_get_children(tlvp)) { + // get path element + if(!pelm) + return 1; + + // check childs element and add it if not found + json_t *chjson = json_path_get(pelm, "$.Childs"); + if (!chjson) { + json_object_set_new(pelm, "Childs", json_array()); + + chjson = json_path_get(pelm, "$.Childs"); + } + + // check + if (!json_is_array(chjson)) { + PrintAndLog("E->Internal logic error. `$.Childs` is not an array."); + break; + } + + // Recursion + JsonSaveTLVTree(root, chjson, "$", tlvdb_elm_get_children(tlvp)); + } + + tlvp = tlvdb_elm_get_next(tlvp); + } + return 0; +} + +bool HexToBuffer(const char *errormsg, const char *hexvalue, uint8_t * buffer, size_t maxbufferlen, size_t *bufferlen) { + int buflen = 0; + + switch(param_gethex_to_eol(hexvalue, 0, buffer, maxbufferlen, &buflen)) { + case 1: + PrintAndLog("%s Invalid HEX value.", errormsg); + return false; + case 2: + PrintAndLog("%s Hex value too large.", errormsg); + return false; + case 3: + PrintAndLog("%s Hex value must have even number of digits.", errormsg); + return false; + } + + if (buflen > maxbufferlen) { + PrintAndLog("%s HEX length (%d) more than %d", errormsg, *bufferlen, maxbufferlen); + return false; + } + + *bufferlen = buflen; + + return true; +} + +bool ParamLoadFromJson(struct tlvdb *tlv) { + json_t *root; + json_error_t error; + + if (!tlv) { + PrintAndLog("ERROR load params: tlv tree is NULL."); + return false; + } + + // current path + file name + const char *relfname = "emv/defparams.json"; + char fname[strlen(get_my_executable_directory()) + strlen(relfname) + 1]; + strcpy(fname, get_my_executable_directory()); + strcat(fname, relfname); + + root = json_load_file(fname, 0, &error); + if (!root) { + PrintAndLog("Load params: json error on line %d: %s", error.line, error.text); + return false; + } + + if (!json_is_array(root)) { + PrintAndLog("Load params: Invalid json format. root must be array."); + return false; + } + + PrintAndLog("Load params: json(%d) OK", json_array_size(root)); + + for(int i = 0; i < json_array_size(root); i++) { + json_t *data, *jtag, *jlength, *jvalue; + + data = json_array_get(root, i); + if(!json_is_object(data)) + { + PrintAndLog("Load params: data [%d] is not an object", i + 1); + json_decref(root); + return false; + } + + jtag = json_object_get(data, "tag"); + if(!json_is_string(jtag)) + { + PrintAndLog("Load params: data [%d] tag is not a string", i + 1); + json_decref(root); + return false; + } + const char *tlvTag = json_string_value(jtag); + + jvalue = json_object_get(data, "value"); + if(!json_is_string(jvalue)) + { + PrintAndLog("Load params: data [%d] value is not a string", i + 1); + json_decref(root); + return false; + } + const char *tlvValue = json_string_value(jvalue); + + jlength = json_object_get(data, "length"); + if(!json_is_number(jlength)) + { + PrintAndLog("Load params: data [%d] length is not a number", i + 1); + json_decref(root); + return false; + } + + int tlvLength = json_integer_value(jlength); + if (tlvLength > 250) { + PrintAndLog("Load params: data [%d] length more than 250", i + 1); + json_decref(root); + return false; + } + + PrintAndLog("TLV param: %s[%d]=%s", tlvTag, tlvLength, tlvValue); + uint8_t buf[251] = {0}; + size_t buflen = 0; + + // here max length must be 4, but now tlv_tag_t is 2-byte var. so let it be 2 by now... TODO: needs refactoring tlv_tag_t... + if (!HexToBuffer("TLV Error type:", tlvTag, buf, 2, &buflen)) { + json_decref(root); + return false; + } + tlv_tag_t tag = 0; + for (int i = 0; i < buflen; i++) { + tag = (tag << 8) + buf[i]; + } + + if (!HexToBuffer("TLV Error value:", tlvValue, buf, sizeof(buf) - 1, &buflen)) { + json_decref(root); + return false; + } + + if (buflen != tlvLength) { + PrintAndLog("Load params: data [%d] length of HEX must(%d) be identical to length in TLV param(%d)", i + 1, buflen, tlvLength); + json_decref(root); + return false; + } + + tlvdb_change_or_add_node(tlv, tag, tlvLength, (const unsigned char *)buf); + } + + json_decref(root); + + return true; +} +